as a volvo mechanic i can say that the best thing you can do is change your oil regularly if you use conventional miles synthetic i wouldnt run past is what i do otherwise youll run into somewhat of a hassle having to do the crankcase ventilation flame trap and associated harnesshoses other than that nothing major check your tranny fluid often when it starts getting dark flush it with high quality synthetic atf or gear oil like redline mt if you have a manual diff fluid should be checked too if it hasnt been before